Using the table below, calculate the Standard Deviation of the portfolio:

$\backslash$table$[[,\backslash$table$[[$Probability$],[$Demand for Company$],[$of this$],[$Demand$]],\backslash$table$[[$Rate of$],[$Return if this$],[$Pemand$]]],[$Occurring$,$Occurs $($k$),],[$Weak$,0\mathrm{.}15,-30\%$